JB4 M4+DP vs Stock Hellcat

[03Saleen]

Just found this on Youtube not sure if it has been posted, pretty good race.

DCT F82 M4
-JB4 Map 7
-AR catless downpipes
-Race gas
-(190lb passenger)

[JoeyBananas]

Kinda depressing that with a tune & racegas it still can't cleanly pull from that thing. I know it has 700HP but I dunno, maybe it's impressive on the M4s part Inguess.

I'm assuming from a dig the M4 would have won


Actually the hellcat had the Jump on the first race and the second race I think the M4 driver said "wrong gear". I guess the M4 was faster.

The redneck in the Z06 at the end was moving, lol

[te37]

So for 1700$ you can have a car that could take 80% of the cars out there.... impressive

[GOLFFRR]

am I seeing that right and he is shifting each time around 5-5500k Rpms? I can't quiet tell bc Im watching on my phone

[te37]

Originally Posted by GOLFFRR

am I seeing that right and he is shifting each time around 5-5500k Rpms? I can't quiet tell bc Im watching on my phone

He is shifting at 6k

[CPWINCH]

Tuned, stock turbos F8x's lose power at higher rpm. You are supposed to shift early in order to be in the best part of your power band.

[zackf80m]

I've killed a few hellcats in my f80 w/ fbo meth and e30 mix. Have to keep these cars in their power band, I usually shift at 6200.

[Tflong24]

I could be wrong and an idiot, feel free to call me either. But doesn't the s55 make peak power from 6500ish THRU 7500?! It doesn't necessarily "fall off" it just makes the same power. So shifting at 6200 you are not at peak power and are dropping to even less power. If you shifted at say 7200 you would drop down to say 6000ish and still be in close to peak hp. Isn't that the point? I can't speak to the power curve of the JB tune, but shifting At 6200 on a stock motor is literally throwing away power.

[zackf80m]

Originally Posted by Tflong24

I could be wrong and an idiot, feel free to call me either. But doesn't the s55 make peak power from 6500ish THRU 7500?! It doesn't necessarily "fall off" it just makes the same power. So shifting at 6200 you are not at peak power and are dropping to even less power. If you shifted at say 7200 you would drop down to say 6000ish and still be in close to peak hp. Isn't that the point? I can't speak to the power curve of the JB tune, but shifting At 6200 on a stock motor is literally throwing away power.

All good, check a few dyno's for modded f80's, power drops off at 6200 ish. Stock, turbos hold power to redline.

[FC4]

Originally Posted by te37

He is shifting at 6k

Correct...several hundred RPM past peak HP.

Do you rookies really believe these cars when modded are fastest when shifted at redline? LOL.

[OMRITIME]

Originally Posted by FC4

Correct...several hundred RPM past peak HP.

Do you rookies really believe these cars when modded are fastest when shifted at redline? LOL.

Just saw this....
Maybe u can clear it for me
I'm with tune and dp (JB4 map 2)
What is the best rpm to start the race
Also when I need to shift

[mike@x-ph.com]

Its impressive that with a tune, downpipe and better fuel the M3 can be at the same level of the hellcat in a straight line

[CPWINCH]

Originally Posted by Tflong24

I could be wrong and an idiot, feel free to call me either. But doesn't the s55 make peak power from 6500ish THRU 7500?! It doesn't necessarily "fall off" it just makes the same power. So shifting at 6200 you are not at peak power and are dropping to even less power. If you shifted at say 7200 you would drop down to say 6000ish and still be in close to peak hp. Isn't that the point? I can't speak to the power curve of the JB tune, but shifting At 6200 on a stock motor is literally throwing away power.

On a stock car, yes its best to shift at redline but on a modified tuned F8x the power band is different. The stock turbos have trouble breathing at higher RPMs and thus dont make as much power in the higher RPMs. So instead of having peak power at redline its shifted a little lower in the powerband. In order to stay in the powerband you must shift earlier.

Originally Posted by OMRITIME

Just saw this....
Maybe u can clear it for me
I'm with tune and dp (JB4 map 2)
What is the best rpm to start the race
Also when I need to shift

Start the race in the lowest gear possible (Thus spooling turbos quickly)
and try to shift around 6k-6.5k. It depends on what speed you are racing from truthfully. But I always try to start the race in the lowest gear I can and then shift early(6kish) from there. I usually redline first and rev second out a little further but 3-7th should all be shifted around 6kish

[Kevin M]

Thats impressive, anyone who thinks otherwise needs to run some math.

Best part of that video was the sound of the ZO6. That dude was gone!